Power column



FIG. 1 is a right side view of a power column showing my new design;

FIG. 2 is a back view.

FIG. 3 is a left side view.

FIG. 4 is a front view.

FIG. 5 is a plan or top view; and,

FIG. 6 is a bottom view. 

The ornamental design for a power column, as shown and described. 